FOR IMMEDIATE RELEASE
Bacterial Mechanism That Could Help Prevent and Treat Lyme Arthritis Identified by New Bay Area Lyme Foundation–Supported Study
Research published in PLOS Pathogens highlights a cell wall–driven trigger of joint inflammation, pointing to new ways to target Lyme arthritis
PORTOLA VALLEY, Calif., January 20, 2026 — Bay Area Lyme Foundation, a leading sponsor of Lyme disease research in the United States, announced the publication of new research in PLOS Pathogens identifying a novel mechanism that may trigger Lyme arthritis, one of the most common and debilitating complications of Lyme disease in the US. The study provides new insight into how the structure of Borrelia burgdorferi peptidoglycan, a component of the bacterium’s cell wall, and its interaction with a Borrelia protein can provoke joint inflammation. In a preclinical model, subtle changes researchers made to the bacterium’s peptidoglycan structure nearly eliminated arthritis despite ongoing infection, suggesting new approaches to reduce Lyme arthritis and joint damage that may complement antibiotics by targeting inflammatory bacterial components.
“Understanding how these bacterial structures provoke inflammation is an avenue towards new approaches for limiting long-term joint damage and possibly treating patients whose symptoms persist despite standard antibiotic therapy,” said Brandon L. Jutras, PhD, lead author of the study and associate professor of Microbiology-Immunology at Northwestern University Feinberg School of Medicine, and a Bay Area Lyme Foundation 2021 Emerging Leader Award winner. “Our findings offer critical insight into how Lyme arthritis is largely driven by specific structural components of Borrelia burgdorferi that may be targeted independent of the other aspects of the infection.”
This new study demonstrates that the chemical makeup and physical structure of peptidoglycan, a structural component of the Borrelia cell wall, play a decisive role in determining whether joint inflammation develops. It also demonstrates how impeding peptidoglycan’s interaction with a specific Borrelia protein may impact the bacterium’s ability to migrate to and persist within joint tissue, resulting in near elimination of Lyme arthritis in the study.














